A UK couple is facing jail time after making bogus bomb detectors that they claimed could locate Madeleine McCann.

Samuel and Joan Tree made claims that the detectors could be used to find drugs and explosives, reported The Independent. However, the items were merely just plastic boxes that had an antenna on it with ripped up shreds of paper inside of it.

The devices were sold for about $2,000.

Judge Richard Marks QC said, “You must understand that all options are open to the court and the strong likelihood given the offence of which you have been found guilty is a custodial sentence.”

The couple made hundreds of thousands of dollars after making about 1,500 of them.

According to the BBC, the couple said the devices could help McCann, who disappeared seven years ago. Some of the bits of torn-up paper included a photo of the girl.